One-Rep Max (1RM) Calculator

Calculate and analyze your max weight for the Big Three lifts.

Lifting Weight

Repetitions (Reps)

Reps

Your Bodyweight (Optional) For Strength Analysis

Estimated 1RM (One-Rep Max)

0 kg

Analyzing...

Strength (5RM)

Hypertrophy (10RM)

Recent Records

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Plate Loading Calculator

Bar:

Set Target Weight

Enter target weight

Plates required for one side.

2.5kg minimum plates used

Training Weight Percentages

Intensity (% 1RM)	Weight	Reps	Purpose
Enter values to generate chart.

1RM Calculation Principle and Usage

1RM (One Repetition Maximum) is the maximum weight you can lift for a single repetition. Knowing your 1RM is essential for planning structured training routines focused on hypertrophy, strength, or power.

Epley Formula: Generally more accurate for higher reps (8+ reps).
Brzycki Formula: Highly reliable for lower reps (5 or fewer reps).

This calculator uses the average of these two popular formulas to reduce estimation error and suggest safe training weights. Since testing your actual 1RM can be risky, this calculation method is recommended for indirect measurement.